基于双频高动态探地雷达技术的道路地下病害检测研究  

Research on road underground disease detection by dual-frequency GPR based on high-dynamic range technology

作　　者：曾雄鹰 王佳龙 梁晓东 余涛 黄小林 ZENG XiongYing;WANG JiaLong;LIANG XiaoDong;YU Tao;HUANG XiaoLin(Hunan Lianzhi Technology Co.,Ltd.,Changsha 410200,China)

机构地区：[1]湖南联智科技股份有限公司,长沙410200

出　　处：《地球物理学进展》2022年第5期2225-2232,共8页Progress in Geophysics

摘　　要：探地雷达(Ground Penetrating Radar,GPR)以其快速、无损和高分辨率等优势已被广泛应用于道路地下病害体的排查应用.针对传统时域单主频天线GPR在勘探深度和分辨率上的局限性,本文提出了一种基于双主频高动态GPR检测系统的道路地下病害检测方法,通过二维正演,模拟道路地下典型病害体的电磁响应,获得病害体的典型GPR特征图谱,为实际病害的客观判读和科学解译提供理论依据.并以某区道路地下病害的实测GPR数据为例,给出了双主频高动态GPR采集的参数设置及数据分析流程.钻探验证结果表明,高频回波信号对浅部薄层具有较高分辨率,能较清晰地识别3 m以上浅部病害体,低频回波信号具有较高信噪比,能有效识别3 m以下深部病害体,兼顾了探测深度和纵向分辨率的双主频GPR检测系统,能较好地识别地下病害类型、位置、埋深及影响范围,可为城市道路病害排查与防治提供技术支持.Ground Penetrating Radar(GPR)is widely used in the detection of underground diseases on roads due to its comprehensive,fast,non-destructive and high-precision advantages.At present,the detection depth of high-frequency antennas existing in traditional GPR is insufficient,while low-frequency antennas have low resolution,detection depth and detection accuracy.Can not take into account other issues,this paper proposes a dual-frequency GPR based on high-dynamic range acquisition system,taking into account the detection depth and detection accuracy of the road underground disease detection method.Through two-dimensional forward modeling,the response characteristics of typical road underground cavity diseases are simulated,and the GPR characteristic map of cavity diseases is initially obtained,which provides a theoretical basis for the interpretation of actual diseases.The results of drilling verification examples show that the high-frequency antenna two-dimensional GPR profile has a high resolution for shallow layers and can clearly distinguish underground diseases less than 3 m shallow.The low-frequency antenna two-dimensional GPR profile has a high deep signal-to-noise ratio and low noise level.It can clearly distinguish the disease bodies deeper than 3 m underground,which supplements the lack of detection depth of high-frequency antennas,and forms a comprehensive detection system that takes into account the detection depth and detection accuracy.It can more accurately identify the types of underground diseases,delineate their locations,and Buried depth and scope.The conclusions of the study can provide important technical support for the prevention and control of urban road diseases.

关 键 词：双频高动态探地雷达 地下病害 探测深度 纵向分辨率 正演模拟 

分 类 号：P631[天文地球—地质矿产勘探]